Yes, it would be a number of about five pokémons that could be chosen in that PC that is inside the secret base, but not necessarily that they should be walking but as if it were a free pokemon walking inside the base itself
In my secret base I realized that maybe it would be a good idea to have several pokemons inside your secret base, so I'm here to suggest that maybe in the next updates it would be something cool to be able to leave your pokemon that you choose on the pc following